In addition, the computer cannot find the GPU when we type 'dxdiag' in the cmd prompt. This may be a driver-related issue and this [http://www.bsocialshine.com/2016/06/how-to-fix-all-dll-file-missing-error.html article] suggests that installing 'Directx end user runtime web installer' will fix the problem.
==Uninstall and Reinstall Drivers (04/20/2019)==
I have uninstalled NVIDIA graphic drivers by
(1) opening control panel -> remove application -> remove NVIDIA graphic driver,
(2) device manager -> remove device -> remove device and associated drivers, and
(3) restarted the computer
I have reinstalled a new driver downloaded from [https://www.nvidia.com/content/DriverDownload-March2009/confirmation.php?url=/Windows/419.67/419.67-desktop-win10-64bit-international-crd-whql.exe&lang=us&type=TITAN NVIDIA page] using the default setting.
However, the old error
The code execution cannot proceed because wlanapi.dll was not found. Reinstalling the program may fix this problem.
is still there.